[ianburrell]

There is a difference between iPad and iPhone apps. The former run full screen, and the latter letterboxed.

I don’t use iPhone apps on this iPad Mini, they are too painful. I use the Instagram and Blue Sky web sites instead.

[Jtsummers]

I don't use either of those services so I was unaware. So I guess there are still some apps out there without a proper iPad interface. I haven't encountered any in at least a decade though and they seem to be in the minority. Apple has gone to great lengths to make it easy to at least make something that fits on the iPad even if you don't try to make it properly native and use the screen real estate effectively. So that strikes me as laziness on the part of the Instagram and Bluesky app developers to not even try.